class MyClassB11(object):

    @staticmethod
    def hello():
        print("i m hello in moduleb.file1.MyClassB11")


class MyClassB12(object):

    @staticmethod
    def hello():
        print("i m hello in moduleb.file1.MyClassB12")

    @staticmethod
    def callOther():
        MyClassB11.hello()

# MyClassB12.callOther()